Setwork



May 22. 1928.

1,671,049 E. c. SHAW SET WORK Filed May 10, 1926 UNITED STATES PATENT ,ol-" -"icE.

ERNEST c. .SHAW, 0E

MANUFACTURING 0 DELAWARE.

'This invention relates in general provements in 'lates more spe Application filed to imsaw mill set works, and recifically to improvements 1n the construction and operation of Trout power set works of the -type Letters Patent No. 995,205,

disclosed in granted June An object oi" the invention is to provide a set works which 1S simple in construction and efiicient 1n operation.

In the Trout set works as above identifie used commercially to a disclosed in the d patent and as heretofore large extent, the

column shaft which is rotatable during settin g and receding. operations is connected by toothed gearing to a for the purpose of the knees. dial of simultaneously rotating the latter to indicate the extent of movement of the knees.

thus employed The toothed gearing frequently has more or less backlash which tends to destroy the accuracy ofindication by the dial.

It is an object of the present invention to provide simple and effective means for maintaining accurate indication of the location of the knees by virtue-of a dial operated by the column shaft, regardless of the existence of lost motion or backlash in the gearing which rotates the dial. with the present improvement the dial is constantly urged about its In accordance pivotal support in the same direction by a spring or other resilient means thereby preventing lost motion or backlash in the gearing from efiecting the accuracy of the indi'cation afiorded by the dial.

A clear conception of an embodiment of the invention and ratus constructed of the operation of appain accordance therewith,

may be had by referring to the drawlng accompanying specification in and forming a part of this which like reference characters designate the same or similar parts in the various views.

' Fig. 1 is a part sectional view of the upper portion of the column and associated parts of an improved Trout power set Works.

Fig. 2 is a to p view of an improved Trout power set works.

Fig; 3 1s a sectlonal VIOW- of the spring casing for con predetermined mounting.

The improve stantly urging the dial in a direction about its pivotal d power set works specifically MILWAUKEE, Wisconsin, ASSIGNOB, OMPANY, 0E MILWAUKEE, Wisconsin, A conrozwnox or ing secured to the column SETWOBK. I

May-10, 1926. kriallio. 107,981.

7, the dial 4 being rotatable with butat :a

considerably slower speed than the column shaft 2 :by means of spur gears .11, 12 meshwith internal teeth 13 of the dial Land with the teeth of a pinion 14 .secured to the column shaft 2, respectively. ratio of thesetransmission gears is ordinarily such that the dial 4 makes one complete revolution for eight revolutions of the column shaft 2. The spur gears .11, :12 are pivotally supported upon aEsta-tiunary cross plate 5 3. A spring casing 15 is rotatably supported upon a pivot 20 supported by the cross plater5, and has .ex-

'ternal teeth 16 which mesh with the internal teeth 13 of the dial 4. A coil spring 17 has its inner end secured to the hub of the casing 15 by means of a fastening 19, and the outer end of the spring 17 is permanently attached to the cross plate 5 by means of a pin 18. A stationary dial pointer 9 cooperates with the graduations on the upper surface of the dial 4 andis attached to the column 3.

The periphery of the ratchet wheel 7 is provided with teeth 25 which are engageable with the teeth of a pawl block 30 carried. by a grip lever .21 which is pivotally supported upon the setting arm '6. The setting arm 6 is mountedto swing'freely about the axis of the column shaft 2 when the pawl block 30 is released by the grip lever 21, and the arm 6 is engageable' with a. home stop 29 on the column 3 to positively arrest its movement, as Well as the movement of the ratchet wheel 7 and of the column shaft 2, when the pawl block 30 is in operative position. The setting arm 6 also has a depending projection engageable with a gage latch 22. The gage latch .22 is movable about the axis of the column. shaft 2 by means of a gage lever 26, and has teeth adapted to interlock with peripheral teeth of the gage plate 8 and to thereby provide To ALLIS 'CEALMEB'S setting arm 6 which is engageable with the bumper 27 secured to thelever 10.

'During normal operation of the set works, the gage latch 22 is set by means of the gage lever 26, to any desired, position about the gage plate 8, thus determiningthe limit of movement of the setting arm, 6 in a counterclockwise direction as viewed in Fig. 2. If the setting arm. 6 is not in engagement with the latch 22, it may first be brought into such position of engagement by releasing the pawl block and shifting the arm 6 with the grip lever 21. l/Vhen the power is applied to set the .knees forwardly, the column shaft 2 and the ratchet wheel 7 are rotated 11]. a clockwise direction thus causing the set ting arm 6 to move toward the home stop 29, by virtue of the interlock between the pawl block 30 and the teeth 25. As the setting arm 6 strikes the home stop 29, mo-

tion of the column shaft in a clockwise divrection is positively arrested and motion of number of boards out.

the knees is simultaneously likewise positively stopped. Simultaneously with the stopping of the column shaft 2, the pawl 24 is thrown into operative position by the pin 28, bumper 27, and lever 10, thereby preventing recoil due to the sudden stopping of the column shaft 2 by the home stop 29. During rotation of the column shaft 2 while setting, the dial 4 is also moved in a clockwise direction by virtue of the gearing 11, 12, 14,

but ata much slower speed. The graduations on the dial4 are such that this dial indicates the width of each board and the "In order to secure subsequent setting of the-knees, the grip lever 21 must first be manipulated to release the pawl block 30 after which the setting arm 6 is returned to a position of engagement with the gage latch 22. Operation of the lever to throw on the power, automatically releasesthe pawl 24 and permits subsequent setting motion of the column shaft 2. When it is desired to recede the knees, the pawl block 30 and the pawl 24 are released from the ratchet wheel 7 and the column shaft 2 is rotated in counterclockwise direction as I viewed in Fig. 2'until the knees have reached the de sired position.

During operation of the set works, the

ing internal teeth,

through said internal spring 17 is constantly under tension, the tension decreasing as the dial 4 is advanced in a clockwise direction. This tension of the spring 17 tends to urge the dial 4 in a clockwise direction at alltimes thereby taking up the lost motion or backlash in the gears 11, 12, 14. By thus taking up the backlash, the accuracy of indication afforded by the dial 4 will always be greater, and the dial 4 is not permitted to overtravel due to backlash and thereby destroy such accuracy of indication. The tension on the spring 1'? is such that the pressure tending to produce rotation of the dial 4 in a predetermined direction is about two pounds when the dial 4 is at the end ofits travel, and reaches a maximum of about four and a half pounds at the beginning of such travel.

it should be understood that it is not desired to limit the invention to the exact details of construction and operation herein shown and described, for various modifications within the scope of the claims may occur to persons skilled in the art.

It is claimed and desired to secure by tion to said dial in a predetermined direc tion, and means for constantly urging said dial to rotate about. said axis in the same direction. 7

2. In a set works, a shaft, a dial supported by and rotatable about the axis of said shaft, toothed gearing for intermittently transmitting rotary motion from saidshaft to said dial in a predetermined direction, and a spring for constantly urgingsaid dial to rotate about said axis in the same direction.

3. In a set works, a column shaft, a dial supported by and rotatable about the axis of said shaft, gearing for transmitting motion from said shaft to said dial in a predetermined direction, a casing rotatable by said dial, and a spring operable by said casing to constantly urge said dial about said axis in the same direction.

4. In a set works, cured to said shaft, a

dial rotatable by and about the axis of'said shaft, said dial haw gears for transmitting said pinion to said dial teeth, a casing having external teeth engageable with said internal teeth, and a coil spring operable by said casing to constantly urge said dial to rotate about the axis of said shaft in a predetermined direction.

In testimony whereof, the signature of the inventor is affixed hereto.

ERNEST o. SHAW.

rotary motion from a shaft, a pinion se 

